使用FileFilter的ListActivity

Question

我試圖擴展一個教程，我發現here關於創建一個簡單的文件瀏覽器。我想添加一個FileFilter只看音頻文件。不過，我仍然看到除了在我的字符串數組中定義的文件類型以外的其他文件類型。感謝任何幫助，我可以得到。

public class SDCardExplorer extends ListActivity { 

private String mediapath = new String(Environment.getExternalStorageDirectory().getAbsolutePath()); 

private List<String> item = null; 
private List<String> path = null; 

private TextView mypath; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.medialist); 

    mypath = (TextView) findViewById(R.id.mypath); 

    LoadDirectory(mediapath); 
} 

// class to limit the choices shown when browsing to SD card to media files 
public class AudioFilter implements FileFilter { 

    // only want to see the following audio file types 
    private String[] extension = {".aac", ".mp3", ".wav", ".ogg", ".midi", ".3gp", ".mp4", ".m4a", ".amr", ".flac"}; 

    @Override 
    public boolean accept(File pathname) { 

     // if we are looking at a directory/file that's not hidden we want to see it so return TRUE 
     if ((pathname.isDirectory() || pathname.isFile()) && !pathname.isHidden()){ 
      return true; 
     } 

     // loops through and determines the extension of all files in the directory 
     // returns TRUE to only show the audio files defined in the String[] extension array 
     for (String ext : extension) { 
      if (pathname.getName().toLowerCase().endsWith(ext)) { 
       return true; 
      } 
     } 

     return false; 
    }  
} 

private void LoadDirectory(String dirPath) {  

    mypath.setText("Location: " + dirPath); 

    item = new ArrayList<String>(); 
    path = new ArrayList<String>(); 

    File f = new File(dirPath); 
    File[] files = f.listFiles(new AudioFilter()); 

    // If we aren't in the SD card root directory, add "Up" to go back to previous folder 
    if(!dirPath.equals(mediapath)) { 

     item.add("Up"); 
     path.add(f.getParent()); 
    } 

    // Loops through the files and lists them 
    for (int i = 0; i < files.length; i++) { 
     File file = files[i]; 
     path.add(file.getPath()); 

     // Add "/" to indicate you are looking at a folder 
     if(file.isDirectory()) { 
      item.add(file.getName() + "/"); 
     } 
     else { 
      item.add(file.getName()); 
     } 
    } 

    // Displays the directory list on the screen 
    setListAdapter(new ArrayAdapter<String>(this, R.layout.mediaitems, item)); 
} 

}

Answer 1

我認爲這個問題是在下面的行：

if ((pathname.isDirectory() || pathname.isFile()) && !pathname.isHidden()){ 
     return true; 
    } 

問題是邏輯說是路徑的目錄或文件，然後在路徑不隱藏。您可能只想查找路徑是否爲目錄。

嘗試將其更改爲以下：

if (pathname.isDirectory() && !pathname.isHidden()) { 
     return true; 
    }